a general rule-of-thumb: sativas give you the clearheaded UP highs, while indicas tend towards the 'couchlock' effect ... either can be manipulated thru hybridization, or harvesting at a certain point of trichome maturization ... for a spacey-type high, 'Haze' strains are the most powerful, but a pain-in-the-ass to grow, for several reasons I won't go into here ... I would recommend a Cinderella 99 strain, they are easy to grow, extremely potent, low-odor, and bred specifically for quick indoor growing (usually about 50-55 days flowering to finish) ... :smokin: